Radius and contour cutting attachment for grinding-machines.



A. ZEIDLER.

RADIUS AND CONTOUR CUTTING ATTACHMENT FOR GRINDING MACHINES. APPLICATION FILED AUG-30. I911. RENEWED MAR. 15.1919.

Patented Apr. 22,1919.

2 SHEETSSHEET I.

v Ill/l/E/VTOH of az'w Arron/115m A. ZEIDLERL' RADIUS AND CONTOUR CUTTING ATTACHMENT FOR GRINDING MACHINES.

APPLICATION FILED AUG-30, I9I7- RENEWED MAR. I5. I9I9.

Patented Apr. 22,1919.

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2 SHEETS-SHEET 2.

l/VI/E/WOI? tizezakw WITNESSES chines and has to deal more particularly with .an attachment for supporting the diamond. or carbon point in such To all whom it may concern:

anrnonranmtm or srermn, massncnusmrs. -Ius AND con'rona Corrine, arrncn'mnn'r roe enmnme-macnmns.

Beit known that I,- ARTHUR Zmnnnn, a citizen of the United States, and a' resident of Springfield, in the county of H'ampden and State of Massachusetts, have. invented a new and Improved Radius and Contour Cut ting Attachment for Grinding-Machines, of which the following is a full, clear, and exact description. 4

This invention relates to grinding mas a manner that any desired contour can be out in the emery or other grinding wheel.

The invention has for its general objects to 7 improve and simplify the construction and operation of devices of this character so paratively simple and inexpensive to manufacture and so designed that almost an infinite variety of adjustments can be obtained for cutting concave, convex or compound contours.

A more specific object of the invention is the provision of a cutting device of the char-v acter referred .to in which the diamond holding rod is so mounted as to provide for a quick coarse adjustment to operate on wheels of different radii and for fine micrometer adjustment without the use of a gage-whereby very accurate work can be .done.

Another object of the invention is to provide a universal adjustment between the stem or shank and the supporting frame to permit the diamond to be set for operation at c any desired angle.

With such objects in View, and others, the invention comprises various novel features of construction and arrangement of parts I which will be more fully set forth hereinafter taken in connection with the accompanying drawings, in which similar reference characters are employed to designate corresponding parts, and in which-- Figure 1 is a side view of the tachment.

Fig. 2 is a horizontal section on the line 2-2 of Fig. 1; and Y Fig. 3 is a plan view with portions in section.- Referring to the drawings, 1 indicates the stem or shank of the tool and 2 the semi-circular frame or holder. The stem 1 has bifurcations 3 between which extends-a head cutting at- Specification of Letters Intent. Application filed August 30, 1917, Serial No. 188,994; Renewed amt frame 2 Patented Apr. 22, 1219,.

15, 1919. Serial no. 282,906.

. 4, there being a bolt 5 passing through the bifurcations and head so as to constitute a hinge joint whereby the frame 2 can swing on an axis at'right angles to that of the stem 1. .After the desired angular adjustrment of the frame 2 about'the hinge is obtained the nut 6 can be tightened to clamp the --frame in proper position. The head 4 has a stud 7- Which enters a radial opening 8 in the frame 2 and in the stud is an annue lar groove 9 into which is adapted to engage a tapering locking pin 10 screwed into the frame 2 whereby the said frame can be clamped to the stud in any angular position around the stud as an axis. To adjust the frame around thestud the clamping pin or bolt 10 is first loosened and when the exact position is obtained the bolt is tightened.

. The outer extremities of the frame 2 have laterally extending lugs 11 formed with semi-cylindrical bearing surfaces 12 and attached to these lugs are cappieces 13 having bearing recesses 14 whereby the lugs and cap pieces form bearings for the pivots 15 of the cutter carrying yoke 16. The yoke 16 is semi-circular and swings on an axis at right angles to the shank or stem 11 and to one side of the plane thereof so that the yoke 16 can swing through a wide angle without the interfering, whereby it is possible to trim a grinding wheel with a full semi circular contour either concave or convex. Passing through the center of the yoke-16 is a rod 17 which has a diamond or other cutting point 18. This rod 17 is slidable longitudinally in a I barrel 19 which is screwed into the yoke 16 at 20 The barrel 19 has external threads 21 with which engage the internal threads 22 of a'thimble 23, the latter having a detachable engagement with the rod 17 so that by turning the thimble the rod can be moved longitudinally for fine and accurate adjustment. The rod 17 has circumferential grooves 24 spaced preferablyan inch apart and a pin 25 extends through an opening 26 in the thimble 2B and engages in one of the grooves 24 whereby the turning of the thimble will cause the pin 25 to move the diamond carrying rod 17 longitudinally. Preferably the pin 25 is carried by a leaf spring 27 fastened at 28 on the thimble. Byj engaging the free end of the spring by the thumb, the pin can be pulled outwardly and so held while the rod 17 isadjusted inwardly or outwardly according to the diameter of the wheel that is be;- ing dressed or cut. To facilitate fine adjustment micrometer scales 29 and 30 are arranged on the barrel 19 and thinible 23 reand the yoke 16. The outermost sleeve screws into the yoke 16 at 32 and each sleeve has a threaded connection 33 with the adjacent one.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and method of operation will be readily apparent to those skilled in the art to which the invention pertains, and while I have described the principle of operation of the invention together with the apparatus which I now consider to be the best embodiment thereof, I desire'to have it understood that the device shown is merely illustrative and that such changes may be made when desired as are within the scope I claim: In a cutting attachment for grinding maof the appended claim.

chines comprising a movable support, a cutter carrying rod passing through the support, and a plurality of detachably connect ed sleeves surrounding the portion of the rod between the support and the cutting extremity, one of the sleeves being detachably connected with the support. 

